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RecordReader Progress Reporting. - MapReduce - [mail # user]
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...I'd like to get some idea on how the task scheduler relies on RecordReader.getProgress() with version 0.20.2. There are times when I don't have an accurate count of the total re...
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Author: Jane Chen,
2011-03-28, 23:10
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TaskTracker failed to start: NoClassDefFoundError: Configured. - MapReduce - [mail # user]
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...Hi, I was trying to start up a single-node Hadoop cluster using 0.20.2. The namenode, datanode and jobtracker all started fine. The task tracker failed with the foll...
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Author: Jane Chen,
2011-03-16, 21:29
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Split Location. - MapReduce - [mail # dev]
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...Hi, When a map task fails, and the input split contains multiple locations, will the framework choose a different location when re-scheduling the same task? Thanks, Jane...
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Author: Jane Chen,
2011-03-16, 19:57
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Initialization for record writing. - MapReduce - [mail # user]
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...Hi, Looking at 0.21's API, In org.apache.hadoop.mapreduce.RecordReader, there is an initialize() method that I can use for one time work; In org.apache.hadoop.mapreduce.Rec...
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Author: Jane Chen,
2011-01-21, 23:57
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Re: How to Influence Reduce Task Location. - MapReduce - [mail # user]
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...Suppose that the output is written to a database, that only runs on certain nodes. It will be desirable to schedule the reducer tasks to run on the nodes local or close to the d...
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Author: Jane Chen,
2010-12-19, 18:23
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Re: How to Influence Reduce Task Location. - MapReduce - [mail # user]
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...But how does this help me request which host to schedule the reduce task to? Thanks, Jane From: Hari Sreekumar Subject: Re: How to Influence Reduce Task Locati...
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Author: Jane Chen,
2010-12-18, 18:24
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How to Influence Reduce Task Location. - MapReduce - [mail # user]
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...Hi All, Is there anyway to influence where a reduce task is run? We have a case where we'd like to choose the host to run the reduce task based on the task's input key. Any...
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Author: Jane Chen,
2010-12-18, 17:43
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Re: InputFormat in mapred vs. mapreduce. - MapReduce - [mail # user]
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...Harsh, thank you for your response. That's what I guessed. In 0.20, Interface InputFormat under mapred package was deprecated. In 0.2 1, it is no longer deprecated. ...
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Author: Jane Chen,
2010-12-07, 17:52
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InputFormat in mapred vs. mapreduce. - MapReduce - [mail # user]
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...In Hadoop 0.21, I found InputFormat as an Interface in package mapred, and as an abstract class in package mapreduce. The APIs are slightly different. Which one should I choose t...
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Author: Jane Chen,
2010-12-06, 21:35
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